56. I found _______impossible for _______to work out the maths problem.
The place _______interested me most was the Children's Palace.
It was _____back home after the experiments.
The car accident on the main road the other day ________ the careless driving of a driver.
I ordered _______pizza and salad. _______ pizza was nice but the salad was terrible.
______ a certain doubt among the people as to the practical value of the project.